Method of treating air bags



Patented Dec. 11, 1928.

UNITED STA TES PATENT OFFICE..-

STEWART s. xURTz,'m., or AKRON, onro, ASSIGNOR To THE coonvrgz'm TIRE & RUB,

BER COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO.

METHOD OETREEATING- AIR BAGS.

No Drawing.

My invention relates tomethods of preserving the interior surfaces of.airbags and.

it has, for its primary object, theprovision of a material which, when introduced into an airbag, forms a permanent coating over the exposed surfaces.

More specifically, my invention has, for one of its objects, the provision of a material whichf when spread over the inner surface of an airbag, tends to absorb oxygen and thus to become relatively thick and viscous so that it will not flow. i It has been observed that glycerine solutions injected into airbags used'as expansi ble cores during the vulcanization of pneumatic tires, tend to collect in the lower portions of the bags, thus leavin the upper surfaces exposed to the actiono oxygen, which attacks the rubber, rendering it brittle and thus causing cracking.

In a copending application of Cornelis Van Rennes, Serial No. 239,127, filed December 10, 1927, is disclosed a method of forming a protective coating material which, when mjected into an airbag, Will remain uniformly spread over the inner surface thereof. This object is accomplished by employing a glycerine solution containing a material, such as an inert pigment, adaptedto cause it to become thick and relatively viscous.

I have discovered that drying oils are particularly adapted for this purpose. These oils may readily be incorporated into the glycerine by employinga suitable emulsifylng agent, such as soap and a stabilizing ingredient, such as glue. The drying oils'that absorb oxygen from the air, become relatively viscous and thus impart a considerable degree'of viscosity to the glycerine solution to which they are added. Ra e seed oil is a very satisfactory dryingsoil or this purpose. However, linseed oil, cotton seed oil and other unsaturated hydrocarbons, known as drying oils, may also be employed as substitutes therefor. The following is an example of a formula for a compound which gives very excellent results.

Prepare a glue dispersion consisting of. 1

part of glue and 1% parts of water. Alsov prepare a 16% solution of soap. Intermix one volume of a glue dispersion with one volume of glycerine and .2 of a volume of soap solution. Heat these materials and then add, with vigorous agitation, one volume of rape Application filed. November 21, 1927. Serial No. 234.924.

seed oil. Introduce the emulsion thus formed into the bag while yet hot, and rotate and invert the bag in order to distribute the materials over the interior thereofwhile they are still relatively fluid. These materials soon absorb oxygen from the air in the bag and thus become so thick and viscous that they will not flow readily even when subjected to the relatively high temperature required to vulcanize'a tire;

The solution may beintroduced into the bags either before or after they are vulcanized but it is preferable to introduce it before, because it permits the use of air as an inflating gas during the vulcanization of the bag instead of carbon dioxide,'which is usually employed because of its low chemical reactivity.

It will be apparent from the previo s discussion of my invention that I have d'scovembodiments of my invention and described those embodiments in detail, it will be apparent to those skilled in the art that the invention is not so limited, but that various modi fications may be made therein without departing from the spirit of the invention or from the scope of the .appended claims.

,WhatI claim-is: i i

1. A method of preserving the interior surfaces of airbags which comprises introduc inginto the bag a solution containing glycerine and a drying oil.

2. A method of preserving the interior Sl11- faces of airbags which comprises introducing into thebags a. solution containing glycerine, a drying oil and an emulsifying agent.

3. A method of preserving the interior surfaces of airbags which comprises introducing into the bag a solution containing glycerine, a drying and a stabilizing ingredient.

4. A method of preserving the interior surfaces of airbags which comprises introducing into the bags an emulsion composed of glycerine, a drying oil, an emulsifying agent and a sta-bilizing ingredient. 1

5. A ,method of preserving airbags which oil, a'n emulsifying agent ducing into the bags a solution of glycerine, rape seed oil, an emulsifying agent and a stabilizing ingredient.

9. A method of preserving the interior surfaces of airbags which comprises introducing intothe Bags a solution of glycerine, rape seed oil, glue and soap.

In witness whereof, I have hereunto signed my name.

Signed at Akron, in the county of Summit, and State of Ohio, this 19th day of November,

STEWART S. KURTZ, JR. 

